<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog"
            >添加分类</el-button
          >
        </el-col>
      </el-row>
      <!-- 表格 -->
      <tree-table
        :data="catelist"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        :show-index="true"
        index-text="#"
        border
        class="treeTable"
      >
        <template slot="isok" slot-scope="{ row }">
          <i
            class="el-icon-success"
            v-if="!row.cat_deleted"
            style="color: lightgreen"
          ></i>
          <i class="el-icon-error" v-else style="color: red"></i>
        </template>
        <template slot="order" slot-scope="{ row }">
          <el-tag size="mini" v-if="row.cat_level == 0">一级</el-tag>
          <el-tag size="mini" type="success" v-else-if="row.cat_level == 1"
            >二级</el-tag
          >
          <el-tag size="mini" type="worning" v-else>三级</el-tag>
        </template>
        <template slot="opt" slot-scope="{ row }">
          <el-button type="primary" icon="el-icon-edit"></el-button>
          <el-button type="danger" icon="el-icon-delete"></el-button>
        </template>
      </tree-table>

      <!-- 分页器 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 5, 10, 15]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>
    <!--添加分类对话框  -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addCateDialogClosed"
    >
      <!-- 添加分类的表单 -->
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级名称：">
          <el-cascader
            v-model="selectedKeys"
            :options="parentCateList"
            :props="cascaderProps"
            @change="parentCateChange"
            clearable
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Cate",
  props: [],
  data() {
    return {
      //查询条件
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5,
      },
      //商品列表
      catelist: [],
      //总数据条数
      total: 0,
      //为table指定列
      columns: [
        {
          label: "分类名称",
          prop: "cat_name",
        },
        {
          label: "是否有效",
          type: "template",
          template: "isok",
        },
        {
          label: "排序",
          type: "template",
          template: "order",
        },
        {
          label: "操作",
          type: "template",
          template: "opt",
        },
      ],
      //控制添加分类的对话框显示和隐藏
      addCateDialogVisible: false,
      //添加分类的表单数据对象
      addCateForm: {
        cat_name: "",
        cat_pid: 0,
        cat_level: 0,
      },
      //表单校验规则
      addCateFormRules: {
        cat_name: [
          { required: true, message: "请输入分类名称", trigger: "blur" },
        ],
      },
      //父级分类列表数据
      parentCateList: [],
      //级联选择器的props属性
      cascaderProps: {
        expandTrigger: "hover",
        value: "cat_id",
        label: "cat_name",
        children: "children",
        checkStrictly: "true",
      },
      //选中的父级分类的id数组
      selectedKeys: [],
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取商品分类
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: this.queryInfo,
      });
      if (res.meta.status !== 200)
        return this.$message.error("获取商品分类失败");
      this.catelist = res.data.result;
      this.total = res.data.total;
    },
    //监听pagesize变化
    handleSizeChange(newsize) {
      this.queryInfo.pagesize = newsize;
      this.getCateList();
    },
    //监听pagenum的变化
    handleCurrentChange(newpage) {
      this.queryInfo.pagenum = newpage;
      this.getCateList();
    },
    //点击添加分类对话框
    showAddCateDialog() {
      //获取父级列表
      this.getParentCateList();
      this.addCateDialogVisible = true;
    },
    //获取父级分类的列表
    async getParentCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: { type: 2 },
      });
      if (res.meta.status !== 200)
        return this.$message.error("获取父级分类失败");
      this.parentCateList = res.data;
    },
    //选择项变化
    parentCateChange() {
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid =
          this.selectedKeys[this.selectedKeys.length - 1];
        this.addCateForm.cat_level = this.selectedKeys.length;
        return;
      } else {
        this.addCateForm.cat_pid = 0;
        this.addCateForm.cat_level = 0;
      }
    },
    //点击按钮添加新的分类
    addCate() {
      this.$refs.addCateFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          "categories",
          this.addCateForm
        );
        if (res.meta.status !== 201) return this.$message.error("添加分类失败");
        this.$message.success("添加分类成功");
        this.getCateList();
        this.addCateDialogVisible = false;
      });
    },
    //对话框关闭事件
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields();
      this.selectedKeys = [];
      this.addCateForm.cat_level = 0;
      this.addCateForm.cat_pid = 0;
    },
  },
};
</script>

<style lang="less" scoped>
.treeTable {
  margin-top: 15px;
}
.el-cascader {
  width: 100%;
}
</style>